Here is the photo of two gigantic Archimedes screws I mentioned in class. Click on the photo to enlarge it if you wish.
I thought our lesson on "Water Raising Devices" went quite well, and I hope that you are start to "think about history". (That's a quote from a video I will show you on Tuesday)
oh, here is the link from Wikipedia about the Archimedes Screw. http://en.wikipedia.org/wiki/Archimedes%27_screw. It has some interesting graphics if you are interested.